Pulp-screen.



BOYD.` V

PULP SCREEN. ArrmoATIoN IIILED 1220.4, 19o?.

Paten'd Feb. 2, 1909.

Tij-1 Arrow/EVS sauras Parnnr carton Briton WILLARD Bern, ornEAnsBoao,

'rute-sonnen. i

y No. 911,469.

Be it knownthat I, BYRON W Born, a vcitizen of theUni-'ted States, and aresident foi Readsboro, 'in the county of Bennington and State ofVermont, have invented a new V.Spe'ccation ef Letters Patent.application sled Daoemter 4, .1907. serial No. assess.

and Improved Pulp-Screen, of which the tol- 'lcwmgfis 'a iull, clear,andexac't description.

ilhi's invention isan improvementin pulp-screens of a sim le and com actnature,

adapted to'eec'tive y and rapi ly separate thecoarse product of pulpvfand such similar materials from the fine pulp4 and water, bycentrifugal action. l u

f'Tfhe invention further' resides in certain special `features of4construction and combi- '.nationfof' parts aswillbehereinaft'erlparticu-- 1an described andsetforth in the c' aims.4

. ference is to be had to the accompany- Y drawings forming a parteithis specication, in'whlch similarcharacters of reference indicate`ccfirrespending' parts in -both views.

Figure- -'1,is.a central verticalv section 'through apul-pscreenvemhoelyin my inven- V yis Ia sectionon t eline 2&2 lofflig-,l,lookingin the direction of the arrow.

ln vthe vcor'is'truction of the lmachine-any k'smi'table ibase 5 isemployed,"to`-which are rigidly ixedby boltsorother suitable means,

standards 6, spaced a `art and carrying bear-- ings at their u peren s,in which Ais'journaled 4a substantial y Ihoriz'ontallyfarranged shaft 7,the vlatter -being provided at one end with the usual loose and xedpulleys 8 and 9 resrlectivel andat its 4opr'rosite, end is slig radialopenings 10 at `the inner portion :nigieliy attached to the' .Shaft i715hat@ the standards 6,:.is the-screen proper, which is-econicalfotm andconsists @of fa Ihead 11 vtion with the screen. -The sp1der-. 12 has aninwardlyf,

and a spider-12,'v connected together at or tly en argedand of hollowform as ine'. f dicafted at 9, and provided lwith 'a seriesof near theirperimeters 'by a .serles of per-l forated plates 13. `The head ,11surrounds the slots in the hollow portion 9a of the shaft 7, and isconstructed with a number fof curved channels, each registering with oneof said slots, as shown in li'ig. 2, and discharging in an annulargroove 14 near the circumference of the head in. communicaperforatedVportion of the i projecting Hangin-.15, arranged at an inclinaytion `to'correspond with the taper of the screen, andto which'the severalperforated secure Patented-Feb. l2, rece.l

'l' plates 13 areatt'ached. These plates, esalso the vtlange, arevprovided with a series toty 'elongated openings orslots 1.6, which*facilitate the discharge of the coa-rser :portionswf the pulp, es ecialy such-as lodgefagainst the spokes'ott e spider.4 l p The perforated:plates '1-3, -as best seen in Fig,`'2, are each slightly xoil-set at.one edge and overlap the next adjacent plate, :,at which' oints theyare' riveted or otherwise dptog'ether and to .the head and spider of thescreen. Surrounding this screen, and y "outlet 20 4by' aninwardlysprojecting 4flange l21 ,the latterextendingto near theperimeter of the screen and to the right ofthe openings 16, whereby thedischarge through these openings will pass into theoutl'et 19.

. Above thescreen a water supply pipe-22, passes into the casing'andhasga perforated .under side to rovide a 'shower to keep the screen-freeand) clear during theo'perationof the machine. `At the enlarged'encl ofthe dcasing a door 23, preferably hinged at .its

--upper ed provides access Within'the-casing and to lt e screen forvinspection, cleaning, Aand other urposes.y v f 'lhepu pv is introducedinto the hollow portion-of the shaft 7 through a pipe 24, and

. substantially conformjng-thereto, isa rcasing 17,'rigidlyattached to tthence passes through the 'slots 10 and vregistering channels of thehead 1 1, ,the latter .discharging into the screen through the annulargroove; this travel of the pulp bein enforced by the centrifugal forcedevelo e by the revolution of the screen. watery ortionor slivers ofthepul will be' forced tlirough the perforations of t e screen undervcentrifugal action, and the coarser portions ofthe pulp will pass outbetween the spokes of the spider and the slots 16. The flange 21 willprevent any intermingling of the screened and' coarser products o thepulp, and the said products will pass out through their respectiveoutlets to the re uired points of dlscharge.

hev mach-ine may be either used for screening the pulp or for thickeningthe same, the operation in both cases being the same; for thickening thepul however, the

perforations in. the screen s ould be very small to allow the passage ofthe water only therethrough.

The invention as shown and described while embodying the preferredpractical construction of my improved pulp screen, is neverthelesssusceptible of modifications falling within the scope of the inventionas dened in the claims annexed. p

Having thus described my invention, I claimv as' new and desire tosecure by Letters Patent:

l. In a pulp screen, a revoluble'conical screen, -a head forming thesmall end of the screen, having an annular groove in its inner face andprovidedl with channels passing through the center thereof to saidgroove, means for introducing pul in the channels of said head, andmeans or revolving the screen.

4 2. In a pulp screen, a screen comprising -a head having an annularroove in lts inner face, with passages dist` arging into said groovefrom the center of the head, a spider spaced from said head and having aflange projectin from one side thereof, and perorated' p ates formingthe circumference of the screen, secured to the head and fiange `of thes ider.

. 3. n a pulp' screen, a conical screen. having the axis thereofsubstantially horizontally disposed andwith the enlarged end thereofopen, said screen havinga series of enlarged openings therein. adjacentto its enlarged end, a -casing surrounding the screen, havingy an outletfor receiving the` materialv passing through the enlarged end o f thescreen and said enlarged openings and an outlet for receiving the'material passing through the screen openings, means for introducing thepulp in the small end of the screen, andl means for revolvingthe screen.

4. In a pulp screen, a substantially horizontally-arranged shaft havinga hollow portion, a screen havin a head provided with a series ofradiating channels communicating with the hollow portion of the -thescreen.

shaft and discharging into the screen, means for introducin the pulpinto the hollow portion of the s aft, and means for revolving the shaft.

5. In a pulp screen, a substantially horizontally-arranged revolublescreen having a head provided with an annular groove in its inner face,with a series of curved channels discharging from the center of the headto said groove, means for introducing the pulp into said channels, andmeans for revolving the screen.

6. In a pulp screen, a shaft having al hollow portion, a screen carriedby the shaft,

`having a head provided with channels communicating with the'hollowportion of the shaft and discharging into the screen, a casingsurrounding the screen, having outlets for the discharge of thematerials, means for introducing the pulp into the hollow portion of theshaft, means for revolving the shaft, and a shower pipe located withinthe casing over the screen. l

7. In a pulp screen, a substantially hori- Azontally-dispcsed shafthaving a hollow portion, a screen attached to the shaft, having a headprovided with passages dischar ing said outlets and the material passingthrough the enlarged end of the screen and the enlarged openingslthroughA the other outlet, means for introducingthe pulp in the smallend of the screen, and means for revolving In testimony whereof I havesigned my

